Weren't the same people who are concerned with global warming the ones that said we were going into an ice age in the 70's?
Were they? Surely these people must be past it by now?
Have a look at this article, which is public domain. I make no recommendation of the article, only that it tries to be balanced, and it is referenced. It is often dangerous to conflate geological timescales with historical timescales, and in the long run we are all dead. (Who said that? JMK?)